Section 135-M. Applicability to prior installations

In  the  event  any
  eligible customer installs energy conservation  measures  subsequent  to
  the  effective  date  of  this  act, but prior to the adoption of a home
  conservation plan by his gas or electric utility, and the work performed
  or obtained by such eligible customer would qualify for financing  under
  a  subsequently  adopted  plan, such eligible customer shall be eligible
  for retroactive financing and participation in the plan adopted  by  his
  utility in accordance with the provisions of this article.